The phrase "diverse set" refers to a group or collection of things that are different from each other in some way. It indicates that there is a mixture of various types or characteristics within that set. Full definition
Worked with diverse set of boys ages 10 - 13. (resume-now.com)
I have worked with children and families in diverse settings for the past 30 years. (janedavidsontherapy.com)
You are able to navigate complex discussions, form strong relationships with diverse sets of people, and be incredibly organized and detail oriented. (goalbookapp.com)